I had to drill in my bathroom renovation task 4 50mm holes into brick. I've asked around and everyone had only the large crowns. As I looked at Amazon and lo and behold, it clicked and waited. I was still wondering what was so lasts 6 days. When I got the packet, as it almost blew me away. It came from England via Royal Mail from Farnborough. I could drill my holes and clean the crown is certainly nothing for artisans but unbeatable home improvement and at the price.